Epson S5U1C17001C, Manual

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7-8
EPSOn
S5U1C17001C ManUal
(C COMPilEr PaCkagE fOr S1C17 faMily) (Ver. 1.5.0)
7 liBrary
7.2.6 Compatibility with Coprocessor instructions
The S1C17 core supports coprocessor instructions.
When using a library compatible with coprocessor instructions, add the "emu_copro_process" function in Vector
Table No. 3 as shown below.
Example: Specifying vector tables (vector.c)
extern void emu_copro_process(void);
func *const vector[] = {
VECTOR(boot), // 0
VECTOR(unalign), // 1
VECTOR(dummy), // 2
VECTOR(emu_copro_process) // 3
};
Note that some models do not support coprocessor instructions.
When you create projects from the IDE, libraries compatible with coprocessor instructions can be specified only if
you selected a model that supports coprocessor instructions.
The libgccM.a library is compatible with multiplication coprocessor instructions.
The libgccMD.a library is compatible with multiplication, division, and remainder coprocessor instructions.
Table 7.2.5.1 lists functions using coprocessor instructions in libgccM.a.
Table 7.2.6.1 Functions using coprocessor instructions in libgccM.a.
function functionality interrupt disable segment
__mulhi3 16-bit multiplication 10 cycles
__mulsi3 32-bit multiplication 14 cycles
Table 7.2.5.2 lists functions using coprocessor instructions in libgccMD.a.
Table 7.2.6.2 Functions using coprocessor instructions in libgccMD.a.
function functionality interrupt disable segment
__mulhi3 16-bit multiplication 14 cycles
__mulsi3 32-bit multiplication 17 cycles
__divhi3 Signed 16-bit division 14 cycles
__modhi3 Signed 16-bit remainder calculation 14 cycles
__udivhi3 Unsigned 16-bit division 14 cycles
__umodhi3 Unsigned 16-bit remainder calculation 14 cycles